package Thread_.homework;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

/**
 * 编写代码, 基于 Callable 实现 1+2+3+...+1000
 * Callable:一个接口,带有返回参数,通过重写call方法完成任务
 * 要FutureTask类坐Thread和Callable的 粘合剂
 */
public class test21 {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        Callable<Integer> callable = new Callable<Integer>(){
            @Override
            public Integer call() throws Exception {
                int count=0;
                for(int i=1;i<=1000;i++){
                    count+=i;
                }
                return count;
            }
        };
        FutureTask<Integer> futureTask = new FutureTask<>(callable);
        Thread thread = new Thread(futureTask);
        thread.start();
        System.out.println("count= "+futureTask.get());

    }
}
